feat: Added IAssignable.Unassign()

Engine.Core/BehaviourController.cs

@@ -15,6 +15,7 @@ public class BehaviourController : IBehaviourController
 
     public Action<IBehaviourController, IBehaviour>? OnBehaviourAdded { get; set; } = null;
     public Action<IBehaviourController, IBehaviour>? OnBehaviourRemoved { get; set; } = null;
+    public Action<IAssignable>? OnUnassigned { get; set; } = null;
     public Action<IAssignableGameObject>? OnGameObjectAssigned { get; set; } = null;
 
 
@@ -95,6 +96,16 @@ public class BehaviourController : IBehaviourController
         return true;
     }
 
+    public bool Unassign()
+    {
+        if (GameObject.Initialized)
+            return false;
+
+        _gameObject = null!;
+        OnUnassigned?.Invoke(this);
+        return true;
+    }
+
     public void Update(GameTime gameTime)
     {
         if (!GameObject.StateEnable.Enabled)